由钱德拉X射线观测证实的RX J1713 .7 $-$ 3946西南缘激波-云相互作用
Shock-Cloud Interaction in the Southwestern Rim of RX J1713.7$-$3946 Evidenced by Chandra X-ray Observations
摘要：
我们报告的结果钱德拉X射线观测西南部的超新星遗迹（SNR）RX J1713.7 $-$ 3946。我们测量自行的两个X射线明亮的斑点，名为斑点A和B，在该地区可能对应的前向冲击的SNR。对于斑点A和B，测量的速度分别为$3800 \pm 100~\mathrm{km}~\mathrm{s}^{-1}$和$2300 \pm 200~\mathrm{km}~\mathrm{s}^{-1}$。由于一个致密的分子团位于Blob B附近，其较慢的速度归因于激波-云相互作用导致的激波减速。这一结果提供了坚实的证据，表明RX J1713.7 $-$ 3946的前向激波确实与文献中报道的射电观测发现的致密气体发生了碰撞。这两个团的位置和速度差异导致了一种估计，即激波在$\sim 100~\mathrm{yr}$以前遇到过稠密气体。冲击波速度，连同截止能量的同步辐射X射线光谱的斑点，表明在这些地区的粒子加速接近玻姆极限。特别是Blob B，几乎达到了极限，以最快的速度加速粒子。我们讨论了激波-云相互作用对粒子加速效率的可能影响。
英文摘要：
We report on results of Chandra X-ray observations of the southwestern part of the supernova remnant (SNR) RX J1713.7$-$3946. We measure proper motions of two X-ray bright blobs, named Blobs A and B, in regions presumably corresponding to the forward shock of the SNR. The measured velocities are $3800 \pm 100~\mathrm{km}~\mathrm{s}^{-1}$ and $2300 \pm 200~\mathrm{km}~\mathrm{s}^{-1}$ for Blobs A and B, respectively. Since a dense molecular clump is located close to Blob B, its slower velocity is attributed to shock deceleration as a result of a shock-cloud interaction. This result provides solid evidence that the forward shock of RX J1713.7$-$3946 is indeed colliding with dense gas discovered through radio observations reported in the literature. The locations and velocity differences of the two blobs lead to an estimate that the shock encountered with the dense gas $\sim 100~\mathrm{yr}$ ago. The shock velocities, together with cutoff energies of the synchrotron X-ray spectra of the blobs, indicate that particle acceleration in these regions is close to the Bohm limit. Blob B, in particular, is almost at the limit, accelerating particles at the fastest possible rate. We discuss possible influence of the shock-cloud interaction on the efficiency of particle acceleration.
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